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Previous issue date: 2017-03-09 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / A avalia??o integrada de vulnerabilidade intr?nseca de um aqu?fero constitui uma ferramenta de suma import?ncia como subs?dio ao estabelecimento de pol?ticas p?blicas de preserva??o, prote??o e uso hidroambiental sustent?vel de um manancial subterr?neo. Nesse aspecto, o presente trabalho teve como escopo principal a elabora??o de mapeamentos de vulnerabilidade a partir de dados hidrogeof?sicos, objetivando a identifica??o e delimita??o de sub?reas com diferentes graus de prote??o associados com diferentes vulnerabilidades do Aqu?fero Barreiras, na ?rea do baixo curso do Rio Maxaranguape, nordeste do Brasil. Esses mapeamentos foram elaborados mediante as metodologias Condut?ncia El?trica Longitudinal, GOD (G - natureza do aqu?fero, O - litologia da zona n?o saturada, D - profundidade do n?vel d??gua) e do ?ndice de Vulnerabilidade do Aqu?fero (AVI), as quais s?o fundamentadas em par?metros litol?gicos, hidr?ulicos e geoel?tricos, al?m da espessura da zona n?o saturada. Os resultados obtidos mostram que os dom?nios delimitados por ?ndices de vulnerabilidade s?o aproximadamente concordantes entre si. Em linhas gerais, as classes de vulnerabilidades moderada, alta a extremamente alta, abrangem quase a totalidade da ?rea, delineando tanto a faixa central como a por??o norte e sul da ?rea investigada, conforme valores inferiores a 1 do log c e 5 mS, nas metodologias AVI e de Condut?ncia Longitudinal, respectivamente; e magnitudes superiores a 0.4, segundo a metodologia GOD. Nesse sentido, a ?rea de estudo exibe substancial sensibilidade ? contamina??o de suas ?guas subterr?neas, decorrente essencialmente do cen?rio de ocorr?ncia de forma??es sedimentares de elevada permeabilidade e reduzidas profundidades do n?vel fre?tico, facilitando a percola??o de eventuais cargas contaminantes no sentido do aqu?fero. / The integrated assessment of an aquifer intrinsic vulnerability constitutes an extremely important tool as a subsidy to the establishment of public policies for the preservation, protection and sustainable hydro-environmental use of an underground water source. In this aspect, the main purpose of this work was the elaboration of vulnerability mappings based on hydrogeophysical data, aiming at the identification and delimitation of subareas with different degrees of protection associated with different vulnerabilities of the Barreiras Aquifer in the lower course area of the Maxaranguape River, Northeast of Brazil. These mappings were elaborated using the following methodologies such as Longitudinal Electrical Conductance, GOD (G ? groundwater hydraulic confinement; O ? overlaying strata; D ? depth to groundwater table) and Aquifer Vulnerability Indexes (AVI), which are based on lithological, hydraulic and geoelectric parameters, as well as the thickness of the unsaturated zone. The results show that the domains delimited by vulnerability indexes are approximately concordant with each other. In general terms, the moderate, high to extremely high vulnerability classes cover almost the entire area, delineating both the central and the northern and southern portions of the investigated area, according to values lower than 1 of log c and 5 mS, in the AVI and Longitudinal Conductance methodologies, respectively; and magnitudes higher than 0.4, according to the GOD methodology. Therefore, the study area exhibits a substantial susceptibility to the contamination of its groundwater, mainly due to the occurrence of sedimentary formations with high permeability and reduced depths of the water table, facilitating the percolation of possible contaminant loads towards the aquifer.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23556 |
| Date | 09 March 2017 |
| Creators | Arruda, Renato de Souza |
| Contributors | 67164358400, http://lattes.cnpq.br/4673404543485023, Diniz Filho, Jos? Braz, 22219943453, http://lattes.cnpq.br/7412136542629826, Becegato, Valter Antonio, 00441935800, http://lattes.cnpq.br/3196823526572670, Lucena, Leandson Roberto Fernandes de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM GEODIN?MICA E GEOF?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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